The gauge on Rick's 18-wheeler is broken, so he uses a dowel to
measure the diesel in his tank, which is cylinder-shaped, 20 inches in
diameter, and sits on its side. How can he mark the dipstick to show
1/4 of a tank of fuel?

I have read about "algebraic" spirals called "cissoid" and "conchoid," which Descartes deemed more exact than the "transcendental" logarithmic and Archimedean spirals, but I have not been able to find any other information on these figures.